package com.mico.echart.monitor.server;


import com.mico.echart.monitor.config.GlobalObject;
import com.mico.echart.monitor.model.TreeMaps;
import com.mico.echart.monitor.system.JvmMemoryInfo;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author micocube
 */
@ServerEndpoint(value = "/jvmWebSocket")
@Component
public class JvmMemorySocketServer {
    static Log log = LogFactory.getLog(JvmMemorySocketServer.class);

    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static AtomicInteger onlineCount = new AtomicInteger(0);

    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static CopyOnWriteArraySet<JvmMemorySocketServer> webSocketSet = new CopyOnWriteArraySet<JvmMemorySocketServer>();

    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        // 加入set中
        webSocketSet.add(this);
        // 在线数加1
        addOnlineCount();
        List<TreeMaps> list = JvmMemoryInfo.getUsedMemoryTrees();
        try {
            sendMessage(GlobalObject.writeValueAsString(list));
        } catch (IOException e) {
            System.out.println("IO异常");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        // 从set中删除
        webSocketSet.remove(this);
        // 在线数减1
        subOnlineCount();
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("来自客户端的消息:" + message);

        // 群发消息
        for (JvmMemorySocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 发生错误时调用
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }

    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfo(String message) throws IOException {
        for (JvmMemorySocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                continue;
            }
        }
    }

    public static int getOnlineCount() {
        return onlineCount.get();
    }

    public static void addOnlineCount() {
        JvmMemorySocketServer.onlineCount.incrementAndGet();
    }

    public static void subOnlineCount() {
        JvmMemorySocketServer.onlineCount.decrementAndGet();
    }

    public Session getSession() {
        return session;
    }

    public void setSession(Session session) {
        this.session = session;
    }

    public static CopyOnWriteArraySet<JvmMemorySocketServer> getWebSocketSet() {
        return webSocketSet;
    }

    public static void setWebSocketSet(CopyOnWriteArraySet<JvmMemorySocketServer> webSocketSet) {
        JvmMemorySocketServer.webSocketSet = webSocketSet;
    }
}
